SMIO-01C 510  ABB  Processor module

In this book the focus has been placed on the squirrel cage motor, the most common type of motor on the market. It is relatively cheap and the maintenance cost is normally low. There are many different manufacturers represented on the market, selling at various prices. Not all motors have the same performance and quality as for example motors from ABB. High efficiency enables significant savings in energy costs during the motor’s normal endurance. In the standard for rotating electrical machines, IEC60034-30, four different efficiency classes have been defined. The classes are called IE1, IE2, IE3 and IE4, where motors belonging to IE4 are the most efficient ones. See the graph below to the right. The low level of noise is something else that is of interest today, as is the ability to withstand severe environments. There are also other parameters that differ. The design of the rotor affects the starting current and torque and the variation can be really large between different manufacturers for the same power rating. When using a softstarter it is good if the motor has a high starting torque at Direct-on-line (DOL) start. When these motors are used together with a softstarter it is possible to reduce the starting current further when compared to motors with low starting torque. The number of poles also affects the technical data. A motor with two poles often has a lower starting torque than motors with four or more poles.

The rated current of the motor, which can be found on the motor nameplate, is the current used by the motor when fully loaded and while up in full speed. An unloaded motor will use far less current and an overloaded motor will use more current.

During direct on line start, the current used by the motor is far higher than the nominal current though. Usually between 6-8 times the rated current, but it can be more than 10 times the rated current. This can be clearly seen in a speed-current diagram for the motor, which can be seen below. As the motor accelerates the current will drop and when reaching the rated speed, the current will have dropped to the rated current.

The structure and details of the product：

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